Dump all the key from Hashmap to a vector

I wish to dump all the keys from Hashmap to a vector, how to do it?(The concern here is the performance, I wish to use the minimal resources to do this, however, any suggestion is welcome)
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Vector v = new Vector(map.keySet());

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I guess the best way would be to use the functions API provides:

Vector v = new Vector();
why do you need vector, use the set itself. You have all the power of the collections api on the Set too.
Mayank SAssociate Director - Product EngineeringCommented:
>> The concern here is the performance

BTW, I doubt if Vector will give you better performance than the set itself.
william007Author Commented:
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